Hello,

If you are asking about the books for preparing for your semester exams ,it is better to stick onto your syllabus and the prescribed textbooks.Given below are the list of books that can help you in preparing for your competitive exams.

Networks and Systems - D.Roy Choudhary

Electronic Instrumentation - H,S,Kalsi

Modern digital and analog Communication systems - B.P Lathia,Zhi ding

Communication systems engineering - John G.Proakis,Masoud Salehi

Control System Engineering- I.G Nagrath & M.Gopal B.C

Communication System - Simon Haykins

Elements of Engineering Electromagnetics - N.N.Rao

These books are vast but  can help you in understanding the concepts.

Hello,

You can get the best books for ECE exam reparation from the below link as different important topics are referred from different books. The link is:

https://engineering.careers360.com/articles/what-are-best-books-for-gate-preparation

Hope this helps you.